/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.fn.harness.control;



import com.bff.gaia.unified.vendor.grpc.v1p13p1.io.grpc.ClientInterceptor;

import com.bff.gaia.unified.vendor.grpc.v1p13p1.io.grpc.Metadata;

import com.bff.gaia.unified.vendor.grpc.v1p13p1.io.grpc.Metadata.Key;

import com.bff.gaia.unified.vendor.grpc.v1p13p1.io.grpc.stub.MetadataUtils;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkArgument;



/** A {@link ClientInterceptor} that attaches a provided SDK Harness ID to outgoing messages. */

public class AddHarnessIdInterceptor {

  private static final Key<String> ID_KEY = Key.of("worker_id", Metadata.ASCII_STRING_MARSHALLER);



  public static ClientInterceptor create(String harnessId) {

    checkArgument(harnessId != null, "harnessId must not be null");

    Metadata md = new Metadata();

    md.put(ID_KEY, harnessId);

    return MetadataUtils.newAttachHeadersInterceptor(md);

  }



  // This is implemented via MetadataUtils, so we never actually create an instance of this class

  private AddHarnessIdInterceptor() {}

}